Gabe's roommate fell asleep about 25 minutes ago. Now, he needs to awaken him so that they both can get to a party on time. He is sleep talking about his girlfriend's cat. When Gabe begins laughing, his roommate wakes up. He was in what stage of sleep?
A) NREM-1 sleep
B) NREM-2 sleep
C) NREM-3 sleep
D) REM sleep